for 10 $ u get 8 points for hour
for 40 $ u get 9 points for hour
for 90 $ u get 10 points for hour
for 160 $ u get 11 points for hour
for 250 $ u get 12 points for hour
so, for an increase of 50% in points per hour from 8 to 12 you have to pay 25 times more? That's absurd.
If u think of it, sleeping 12 hours at 8 points will get you to the same recover as 8 hours at 12 points. So why to spend 250$ instead of 20? Are you sure those 4 hours worth it? can u make the extra 230 $, about 60$ per hour? Where u get such income?
Anyway, for those who like values, the report from growing points 2 growing money is messed up:
money / points / increase money / increase points
10 / 64 / 0% / 0%
40 / 72 / 300% / 13%
90 / 80 / 125% / 11%
160 / 88 / 78% / 10%
250 / 100 / 56% / 14%